Electrophotographic toners containing polyalkylene wax or high crystallinity wax

Abstract

Toner particles having at least one toner resin and at least one polyalkylene wax or a wax having a percent crystallinity of 80% or more are described. The wax that is present in the toner particles has a polydispersity of 2.0 or higher or a percent crystallinity of 80% or more, and also preferably has a number average molecular weight of about 2,000 or higher and / or a melting temperature onset of from about 115° C. to about 130° C. Development systems using the toner particles of the present invention are further described. Also, improvements in various properties associated with development systems are further described such as reduced toner dust levels as well as improved toner image abrasion resistance.

Description

[0001] This application claims the benefit under 35 U.S.C. .sctn.119(e) of prior U.S. Provisional Patent Application No. 60 / 317,289 filed Sep. 5, 2001, which is incorporated in its entirety by reference herein.[0002] The present invention relates to toners and development systems for toners.[0003] The image quality currently available with printers and copiers is generally good in that prints have a high solid area reflection density, low background in non-image areas, and consistent print quality from toner lot to toner lot and from the start of a new developer until it is replaced. The present toners, however, are not as good with respect to such properties as toner ruboff (e.g., the abrasion resistance of the fused image). In attempting to improve toner ruboff, a wax, for instance, can be included in the toner. However, waxes can affect triboelectric properties of a toner. This problem of increased triboelectric properties is more pronounced for negatively charging toners. If the...